It's already been sold (£18,000!), and Paul McCartney was given an audio transfer for his personal archive.
http://www.bbc.co.uk/news/uk-england...yside-37197201
Based on the 20-second sample, it's a bit much to call it a 'Beatles' demo...it's a solo demo. Historically it's of massive importance though, a genuinely big find.
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